V. Cianciolo
A5051475760- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Particle accelerators and beam dynamics
- Neutrino Physics Research
- Ion-surface interactions and analysis
- Particle physics theoretical and experimental studies
- Magnetic confinement fusion research
- Nuclear reactor physics and engineering
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Radioactive Decay and Measurement Techniques
- Advanced NMR Techniques and Applications
- Quantum and Classical Electrodynamics
- Quantum Chromodynamics and Particle Interactions
- X-ray Spectroscopy and Fluorescence Analysis
- Electrostatic Discharge in Electronics
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- Radioactive contamination and transfer
- Metal and Thin Film Mechanics
- Random lasers and scattering media
- High-Energy Particle Collisions Research
Oak Ridge National Laboratory
2009-2024
TRIUMF
2006
A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with major improvement in sensitivity compared to the existing limit search for neutron Electric Dipole Moment (EDM). This uses superfluid 4He produce high density of Ultra-Cold Neutrons (UCN) which are contained suitably coated pair measurement cells. The be operated at Spallation Neutron Source Oak Ridge National Laboratory, polarized 3He from an Atomic Beam injected into and transported cells where it serves as...
Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well those reached directly at high energy colliders. Discrimination between different models, however, requires complementary searches in atomic-molecular-and-optical, nuclear and particle physics. In this report, we discuss current status prospects near future a compelling suite such experiments, along with developments needed encompassing theoretical framework.
Abstract nEDMSF aims to measure the neutron electric dipole moment ( d n ) with unprecedented precision. In this paper we explore experiment's sensitivity when operating an implementation of critical dressing method in which angle between and Helium-3 spins ϕ 3 is subjected a square modulation by amount (the “dressing angle”). Several parameters can be tuned optimize sensitivity. We find roughly 10% improvement over previous estimate, resulting primarily from addition waiting period π /2...
We report the first observation of parity-violating 2.2 MeV gamma-ray asymmetry $A^{np}_\gamma$ in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at Spallation Neutron Source Oak Ridge National Laboratory. isolates $\Delta I=1$, \mbox{$^{3}S_{1}\rightarrow {^{3}P_{1}}$} component weak nucleon-nucleon interaction, which is dominated by pion exchange and can be directly related to single coupling constant either DDH meson model or pionless EFT....
We have constructed an apparatus to study DC electrical breakdown in liquid helium at temperatures as low 0.4 K and pressures between the saturated vapor pressure ∼600 Torr. The can house a set of electrodes that are 12 cm diameter with gap 1–2 them, potential up ±50 kV be applied each electrode. Initial results demonstrated it is possible apply fields exceeding 100 kV/cm 1 two electropolished stainless steel for wide range K. also measured current electrodes. Our initial results, I <...
We report the first precision measurement of parity-violating asymmetry in direction proton momentum with respect to neutron spin, reaction ^{3}He(n,p)^{3}H, using capture polarized cold neutrons an unpolarized active ^{3}He target. The is a result weak interaction between nucleons, which remains one least well-understood aspects electroweak theory. provides important benchmark for modern effective field theory and potential model calculations. Measurements like this are necessary determine...
The nEDM experiment at the SNS (nEDM@SNS) is first measurement of neutron EDM to directly measure precession frequency spin due magnetic and electric fields. Previous measurements have inferred by measuring residual polarization neutrons after a long period free precession. This difference provides independent information on potential unknown systematic uncertainties compared previous on-going measurements. It precisely because nEDM@SNS using number novel techniques, that it essential...
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, Tennessee, provides an intense flux of neutrinos in the few tens-of-MeV range, with a sharply-pulsed timing structure that is beneficial for background rejection. In this white paper, we describe how SNS source can be used measurement coherent elastic neutrino-nucleus scattering (CENNS), and physics reach different phases such experimental program (CSI: Coherent Scattering Investigations SNS).
The dependence on applied electric field ($0 - 40$ kV/cm) of the scintillation light produced by fast electrons and $\alpha$ particles stopped in liquid helium temperature range 0.44 K to 3.12 is reported. For both types particles, reduction intensity signal due exhibits an apparent dependence. Using approximate solution Debye-Smoluchowski equation, we show that for can be explained time required geminate pairs recombine relative detector integration time. This finding indicates spatial...
The Nab experiment will measure the correlation a between momenta of beta particle and antineutrino in neutron decay as well Fierz term b which distorts spectrum.
Novel experimental techniques are required to make the next big leap in neutron electric dipole moment sensitivity, both terms of statistics and systematic error control. The nEDM experiment at Spallation Neutron Source (nEDM@SNS) will implement scheme Golub & Lamoreaux [Phys. Rep., 237, 1 (1994)]. unique properties combining polarized ultracold neutrons, 3 He, superfluid 4 He be exploited provide a sensitivity ∼ 10 −28 e · cm. Our cryogenic apparatus deploy two small (3 L) measurement...
The Spallation Neutron Source (SNS), currently under construction at Oak Ridge National Laboratory with an anticipated start-up in early 2006, will provide the most intense pulsed beams of cold neutrons world. At a projected power 1.4 MW, time averaged fluxes and fluences SNS approach those high flux reactors. One flight paths on cold, coupled moderator be devoted to fundamental neutron physics. physics beamline is include two beam-lines; broad band beam, monochromatic beam 0.89 nm for...
Recently, the Collaboration reported a measurement of parity-violating (PV) proton directional asymmetry in capture reaction 3He(⃗𝑛,𝑝)3H at meV incident neutron energies. The result increased limited inventory precisely measured and calculable PV observables few-body systems required to further understand structure hadronic weak interaction. In this Letter, we report experimental theoretical investigation parity conserving (PC) 𝐴PC same (the first ever PC observable energies). As S- P-wave...
Recently, the n$^3$He collaboration reported a measurement of parity-violating (PV) proton directional asymmetry $A_{\mathrm {PV}} = (1.55\pm 0.97~\mathrm {(st\ at)} \pm 0.24~\mathrm {(sys)})\times 10^{-8}$ in capture reaction ${}^3$He$(\vec {n},{\mathrm p}){}^3$H at meV incident neutron energies. The result increased limited inventory precisely measured and calculable PV observables few-body systems required to further understand structure hadronic weak interaction. In this letter, we...
Monte Carlo simulations are being performed to design and characterize the neutron optics components for two fundamental physics beamlines at Spallation Neutron Source. Optimization of cold beamline includes characterization guides benders, transmission through 0.89 nm monochromator, expected performance four time-of-flight choppers. The locations opening angles choppers have been studied using a simple spreadsheet-based analysis that was developed other SNS chopper instruments. spreadsheet...
A system for collecting the scintillation light produced by capture process of ultra-cold neutrons (UCN) on polarized $^{3}$He is discussed and results from simulations its performance are presented. This will be implemented in nEDM@SNS, experiment searching neutron electric dipole moment (nEDM) at Spallation Neutron Source (SNS) Oak Ridge National Laboratory. Simulation show that collection collects average 17 photoelectrons per UCN-$^{3}$He event (sufficient to generate a robust signal),...
We report on a search for the free-decay component of ${\ensuremath{\pi}}^{\ensuremath{-}}$ stopped in water and light materials. A nonzero value this would be an indication anomalous ${\overline{\ensuremath{\nu}}}_{e}$ contamination to ${\ensuremath{\nu}}_{e}$ ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$ production at stopped-pion neutrino facilities. No was observed water, Beryllium, Aluminum, which upper limits were established...
Abstract In this article we describe the photon detection readout electronics for nEDM@SNS experiment. The chosen “photon counting” architecture, which utilizes high-efficiency silicon photomultipliers (SiPMs) and is appropriate low-light applications, allows use of a relatively high SiPM operating voltage. This maximizes efficiency minimizes gain/efficiency voltage-dependence while eliminating direct optical cross-talk.